package com.it.util;

import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;


public class ReadExcel {


	public static void main(String[] args) throws FileNotFoundException, IOException {
		File file = new File("c:/book.xls");
		String[][] result = getData(file, 1);

	}


	public static String[][] getData(File file, int ignoreRows) {

		List<String[]> result = new ArrayList<String[]>();

		int rowSize = 0;

		BufferedInputStream in=null;
		HSSFWorkbook wb=null;
		POIFSFileSystem fs=null;
		try {
			in = new BufferedInputStream(new FileInputStream(file));

			// 打开HSSFWorkbook


			fs = new POIFSFileSystem(in);
			wb = new HSSFWorkbook(fs);


		} catch (Exception e) {
			e.printStackTrace();
		}
		HSSFCell cell = null;


		for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {

			HSSFSheet st = wb.getSheetAt(sheetIndex);

			// 第一行为标题，不取


			for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {

				HSSFRow row = st.getRow(rowIndex);

				if (row == null) {

					continue;

				}

				int tempRowSize = row.getLastCellNum() + 1;

				if (tempRowSize > rowSize) {

					rowSize = tempRowSize;

				}

				String[] values = new String[rowSize];

				Arrays.fill(values, "");

				boolean hasValue = false;

				for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {

					String value = "";

					cell = row.getCell(columnIndex);

					if (cell != null) {

						// 注意：一定要设成这个，否则可能会出现乱码

						//cell.setEncoding(HSSFCell.ENCODING_UTF_16);

						switch (cell.getCellType()) {

							case HSSFCell.CELL_TYPE_STRING:

								value = cell.getStringCellValue();

								break;

							case HSSFCell.CELL_TYPE_NUMERIC:

								if (HSSFDateUtil.isCellDateFormatted(cell)) {


									Date date = cell.getDateCellValue();

									if (date != null) {

										value = new SimpleDateFormat("yyyy-MM-dd")

												.format(date);

									} else {

										value = "";

									}

								} else {

									value = new DecimalFormat("0").format(cell

											.getNumericCellValue());

								}

								break;

							case HSSFCell.CELL_TYPE_FORMULA:

								// 导入时如果为公式生成的数据则无值

								if (!cell.getStringCellValue().equals("")) {

									value = cell.getStringCellValue();

								} else {

									value = cell.getNumericCellValue() + "";

								}

								break;

							case HSSFCell.CELL_TYPE_BLANK:

								break;

							case HSSFCell.CELL_TYPE_ERROR:

								value = "";

								break;

							case HSSFCell.CELL_TYPE_BOOLEAN:

								value = (cell.getBooleanCellValue() == true ? "Y": "N");

								break;

							default:

								value = "";

						}

					}

					if (columnIndex == 0 && value.trim().equals("")) {

						break;

					}

					values[columnIndex] = rightTrim(value);

					hasValue = true;

				}

				if (hasValue) {

					result.add(values);

				}

			}

		}

		try {
			in.close();
		} catch (IOException e) {
			e.printStackTrace();
		}


		String[][] returnArray = new String[result.size()][rowSize];

		for (int i = 0; i < returnArray.length; i++) {

			returnArray[i] = (String[]) result.get(i);

		}

		return returnArray;

	}

	/**
	 *
	 * 去掉字符串右边的空格
	 *
	 * @param str
	 *            要处理的字符串
	 *
	 * @return 处理后的字符串
	 *
	 */

	public static String rightTrim(String str) {

		if (str == null) {

			return "";

		}

		int length = str.length();

		for (int i = length - 1; i >= 0; i--) {

			if (str.charAt(i) != 0x20) {

				break;

			}

			length--;

		}

		return str.substring(0, length);

	}

}
